Nitrogen and organic matter removal and enzyme activities in constructed wetlands operated under different hydraulic operating regimes

Li, Meng; Zhenlin, Liang; Callier, Myriam D.; D’Orbcastel, Emmanuelle Roque; Ma, Xiaona; Sun, Li; Li, Xian; Wang, Shunkui; Song, Xinshan; Liu, Ying

doi:10.1016/j.aquaculture.2018.06.016

Cited by 18 publications

(6 citation statements)

References 54 publications

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“…Treatment of various parameters of primary treated sewage such as BOD, COD, nitrogen, phosphate, and pathogens in a CW was facilitated by a combination of various natural processes including physical, chemical, and biological processes. Most of the organic matter contained in the wetland are stabilized by diverse microbial consortia [40][41][42]. The degree of treatment by CW depends upon the length of HRT, type of filter media, plant species used, and nature of microbial consortia.…”

Section: Microbial Treatmentmentioning

confidence: 99%

“…In wetlands, the main removal mechanism for nitrogen is essentially a microbial process, which consists of nitrification followed by denitrification. In wetlands, the nitrogen cycle is coupled with the carbon cycle, mainly through the denitrification process [42]. Organic nitrogen is converted to ammonia in the wetland by the process of decomposition and mineralization.…”

Section: Mechanism For Nitrogen Removalmentioning

confidence: 99%

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Performance of horizontal flow constructed wetland for secondary treatment of domestic wastewater in a remote tribal area of Central India

Shukla

Gupta

Singh

et al. 2021

Sustain Environ Res

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The purification of the primary treated domestic sewage was performed in the present study through the horizontal sub-surface flow constructed wetland (CW) of 10 × 3.5 m dimension. The study was performed using three setups of CW 1 (Unplanted CW), CW 2 (CW planted with macrophyte Typha latifolia), and CW 3 (CW planted with two species of macrophyte T. latifolia and Commelina benghalensis). The purification experiments were performed by converting one type of CW into the other form sequentially, i.e., CW 1 was built first and after the experiments, it was converted into CW 2 and then CW 3. The CW was filled with a layer of coarse and fine gravel of 70 cm depth as filter media in 1:2 ratio. Each set of wetland was operated for 3 months (12 wk) during which the treatment performance of wetlands for basic physicochemical parameters was evaluated. The CW was operated in continuous mode at an average hydraulic loading rate of 250 L h− 1 and the treated effluent was analysed twice every week at four different sampling points having hydraulic retention times (HRT) of 12, 24, 36 and 48 h for important sewage quality parameters All the three setups of CW were able to clean the primary treated sewage significantly. Among the three sets of wetlands used, CW 3 was the best performer removing 79, 77, 79, 79, and 78% of biochemical oxygen demand, chemical oxygen demand, nitrate, ammonia, and phosphate respectively in 48 h HRT. Among the three sets of wetlands, the CW 3 removed the highest percent of total coliforms, fecal coliforms, and E. coli as 64, 61 and 52% respectively.

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Section: Microbial Treatmentmentioning

confidence: 99%

Section: Mechanism For Nitrogen Removalmentioning

confidence: 99%

Performance of horizontal flow constructed wetland for secondary treatment of domestic wastewater in a remote tribal area of Central India

Shukla

Gupta

Singh

et al. 2021

Sustain Environ Res

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“…Previous study reported that the enzyme activity of microorganisms have close relationship with the microbial decomposition rate on pollutants [44]. Better enzymatic activities and more microbial species in the MBR system are the main reason of excellent biological COD and TN removal [45]. Therefore, microbial enzyme activities were evaluated to make clear the influence and pollutants removal efficiency on ship wastewater treatment.…”

Section: Enzyme Activitiesmentioning

confidence: 99%

“…In summary, the Urease activity seems more sensible to the COD removal while NR activity has more close relationship with the TN removal. Li et al [45] reported that Urease is closely related to the number of matrix microorganisms and organic matter content. In addition, the high Urease activities indicated that the environment is more beneficial to the growth and generation of microorganisms, and better for the purification effect of pollutants [45].…”

Section: Enzyme Activitiesmentioning

confidence: 99%

“…Li et al [45] reported that Urease is closely related to the number of matrix microorganisms and organic matter content. In addition, the high Urease activities indicated that the environment is more beneficial to the growth and generation of microorganisms, and better for the purification effect of pollutants [45]. Wang et al [46] thought that Nitrate Reductase is an essential enzyme in the assimilation process of the exogenous nitrate.…”

Section: Enzyme Activitiesmentioning

confidence: 99%

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Effect of Volume Loading Rate and C/N on Ship Domestic Sewage Treatment by Two Membrane Bioreactors

Cai

Zaidi

Sun

et al. 2019

Period. Polytech. Chem. Eng.

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Design of ship sewage treatment systems that not only satisfy the use of small space on board but also meets International Maritime Organisation (IMO) latest emission standards is still a challenging problem for ship industry. This study provides a comparative disquisition between two different MBR reactors i.e, air-lift multilevel circulation membrane reactor (AMCMBR) and anaerobic/anoxic/aerobic membrane reactor (AOA-MBR) for domestic sewage treatment. The influence of pollutants volume loading rate (VLR) and C/N on effluent chemical oxygen demand (COD), ammonium nitrogen (NH4+-N) and TN for marine domestic sewage was analyzed. The results revealed that AMCMBR showed better removal efficiencies for COD and TN than AOA-MBR. The volume of AMCMBR was only half of the AOA-MBR. In addition, high average value of mixed liquor volatile suspended solids (MLVSS)/mixed liquid suspended solids (MLSS) (i.e. 0.75) of AMCMBR indicated high biomass and good pollutants removal achieved by this reactor. An interesting phenomenon was found in the study regarding Urease activity for the two reactors. Urease activity for AMCMBR in different working conditions all exceeded AOA-MBR and there exist no clear difference of NR activities between AMCMBR and AOA-MBR except for low C/N ratio (i.e. 6 and 4). This phenomenon proved that AMCMBR has a greater performance for treating ship domestic wastewater.

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Effects of PVP-coated silver nanoparticles on enzyme activity, bacterial and archaeal community structure and function in a yellow-brown loam soil

Yan

Huang

Cao

et al. 2020

Environ Sci Pollut Res

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Nitrogen and organic matter removal and enzyme activities in constructed wetlands operated under different hydraulic operating regimes

Cited by 18 publications

References 54 publications

Performance of horizontal flow constructed wetland for secondary treatment of domestic wastewater in a remote tribal area of Central India

Performance of horizontal flow constructed wetland for secondary treatment of domestic wastewater in a remote tribal area of Central India

Effect of Volume Loading Rate and C/N on Ship Domestic Sewage Treatment by Two Membrane Bioreactors

Effects of PVP-coated silver nanoparticles on enzyme activity, bacterial and archaeal community structure and function in a yellow-brown loam soil

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